hw/virtio-rng.h

   1 /*
   2  * Virtio RNG Support
   3  *
   4  * Copyright Red Hat, Inc. 2012
   5  * Copyright Amit Shah <amit.shah@redhat.com>
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or
   8  * (at your option) any later version.  See the COPYING file in the
   9  * top-level directory.
  10  */
  11
  12 #ifndef _QEMU_VIRTIO_RNG_H
  13 #define _QEMU_VIRTIO_RNG_H
  14
  15 #include "qemu/rng.h"
  16 #include "qemu/rng-random.h"
  17
  18 /* The Virtio ID for the virtio rng device */
  19 #define VIRTIO_ID_RNG    4
  20
  21 struct VirtIORNGConf {
  22     RngBackend *rng;
  23     uint64_t max_bytes;
  24     uint32_t period_ms;
  25     RndRandom *default_backend;
  26 };
  27
  28 typedef struct VirtIORNG {
  29     VirtIODevice vdev;
  30
  31     DeviceState *qdev;
  32
  33     /* Only one vq - guest puts buffer(s) on it when it needs entropy */
  34     VirtQueue *vq;
  35
  36     VirtIORNGConf *conf;
  37
  38     RngBackend *rng;
  39
  40     /* We purposefully don't migrate this state.  The quota will reset on the
  41      * destination as a result.  Rate limiting is host state, not guest state.
  42      */
  43     QEMUTimer *rate_limit_timer;
  44     int64_t quota_remaining;
  45 } VirtIORNG;
  46
  47 #endif